Laser vehicle headlight system and detecting method thereof

ABSTRACT

A laser vehicle headlight system for detecting an incident laser light and outputting a headlight includes a headlight body, an optical unit and a light leakage detecting unit. The optical unit is disposed on the headlight body and receives the incident laser light. The optical unit includes a fluorescent member which is disposed on an initial light path of the incident laser light and is illuminated by the incident laser light to induce a stable light traveling along a stable light path. The light leakage detecting unit is disposed on the headlight body. The light leakage detecting unit includes a first elliptical reflecting surface and a light detector. The first elliptical reflecting surface has a first elliptical reflecting focal point and is corresponding to the fluorescent member. The light detector is disposed at the first elliptical reflecting focal point of the first elliptical reflecting surface.

BACKGROUND

Technical Field

The present disclosure relates to a laser vehicle headlight system and adetecting method of the laser vehicle headlight system. Moreparticularly, the laser vehicle headlight system and the detectingmethod of the laser vehicle headlight system use specific ellipticalreflecting surfaces with one common focal point to completely collectthe leakage lights.

Description of Related Art

In the currently known vehicle headlight systems, there are three commontypes of light source technologies: a conventional light source, a LEDlight source, and a laser light source. Most technologies are based onthe conventional light source. The LED light source is used in high ormedium price category vehicles. The laser light source is only mountedon few types of specific vehicles and can realize energy saving, smallsize, high brightness and long-range illumination. For Advanced DriverAssistance Systems (ADAS), the range of image recognition can be furtherextended by using the laser light source, thus enhancing security andattaining the effect of energy saving, environmental protection andinnovation.

The laser light source is different from the conventional light sourceand the LED light source. Instead of directly emitting light, the laserlight source is produced by the yellow fluorescent member that isilluminated by the blue laser beam. In order to meet illumination needsfor the vehicle, the power of the blue laser beam with Class IV is morethan 500 mW. The blue laser beam may render adverse effect to the humanbody due to its huge power. Therefore, it is commercially desirable todevelop a detecting system and method with high safety, high brightnessand real-time detection.

SUMMARY

According to one aspect of the present disclosure, a laser vehicleheadlight system for detecting an incident laser light and outputting aheadlight includes a headlight body, an optical unit and a light leakagedetecting unit. The optical unit is disposed on the headlight body andreceives the incident laser light. The optical unit includes afluorescent member which is disposed on an initial light path of theincident laser light and is illuminated by the incident laser light toinduce a stable light traveling along a stable light path. The lightleakage detecting unit is disposed on the headlight body. The lightleakage detecting unit includes a first elliptical reflecting surfaceand a light detector. The first elliptical reflecting surface has afirst elliptical reflecting focal point and is corresponding to thefluorescent member. The light detector is disposed at the firstelliptical reflecting focal point of the first elliptical reflectingsurface.

According to another aspect of the present disclosure, a laser vehicleheadlight system for detecting an incident laser light and outputting aheadlight includes a headlight body, an optical unit and a light leakagedetecting unit. The optical unit is disposed on the headlight body andreceives the incident laser light. The optical unit includes afluorescent member and a headlight reflecting surface. The fluorescentmember is disposed on an initial light path of the incident laser lightand is illuminated by the incident laser light to induce a stable lightand an offset detecting light. The stable light travels along a stablelight path, and the offset detecting light travels along an offsetdetecting light path. The headlight reflecting surface is disposed atthe stable light path. The headlight reflecting surface receives thestable light, and the stable light is then reflected by the headlightreflecting surface to generate the headlight. The light leakagedetecting unit is disposed on the headlight body and is located on theoffset detecting light path. The light leakage detecting unit includes afirst elliptical reflecting surface and a light detector. The firstelliptical reflecting surface has a first elliptical reflecting focalpoint and is corresponding to the fluorescent member. The firstelliptical reflecting surface is adjacent to the fluorescent member. Thefirst elliptical reflecting surface receives the offset detecting light,and the offset detecting light is then reflected by the first ellipticalreflecting surface to generate a leakage light. The leakage lighttravels along a leakage light path. The light detector is disposed atthe first elliptical reflecting focal point of the first ellipticalreflecting surface and is located on the leakage light path. The lightdetector receives the leakage light and outputs a light leakage signal.

According to another aspect of the present disclosure, a detectingmethod of the laser vehicle headlight system provides a light inducingstep and a leakage light collecting step. The light inducing step is fortransmitting the incident laser light to the fluorescent member so as toinduce the stable light from the fluorescent member. The leakage lightcollecting step is for checking whether or not an offset detecting lightis induced by the fluorescent member according to the light detector.When the fluorescent member induces the offset detecting light, thefirst elliptical reflecting surface receives the offset detecting light,and the offset detecting light is then reflected by the first ellipticalreflecting surface to generate a leakage light. The light detectorreceives the leakage light and outputs a light leakage signal.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1A is a schematic view showing a laser vehicle headlight systemaccording to one embodiment of the present disclosure;

FIG. 1B is a schematic view showing a normal state of the laser vehicleheadlight system of FIG. 1A;

FIG. 1C is a schematic view showing an abnormal state of the laservehicle headlight system of FIG. 1A;

FIG. 2A is a schematic view showing a laser vehicle headlight systemaccording to another embodiment of the present disclosure;

FIG. 2B is a schematic view showing a normal state of the laser vehicleheadlight system of FIG. 2A;

FIG. 2C is a schematic view showing an abnormal state of the laservehicle headlight system of FIG. 2A;

FIG. 3A is a schematic view showing a laser vehicle headlight systemaccording to further another embodiment of the present disclosure;

FIG. 3B is a schematic view showing a normal state of the laser vehicleheadlight system of FIG. 3A;

FIG. 3C is a schematic view showing an abnormal state of the laservehicle headlight system of FIG. 3A; and

FIG. 4 is a flow chart showing a detecting method of the laser vehicleheadlight system according to one embodiment of the present disclosure.

DETAILED DESCRIPTION

FIG. 1A is a schematic view showing a laser vehicle headlight system 100according to one embodiment of the present disclosure; FIG. 1B is aschematic view showing a normal state of the laser vehicle headlightsystem 100 of FIG. 1A; and FIG. 1C is a schematic view showing anabnormal state of the laser vehicle headlight system 100 of FIG. 1A. InFIGS. 1A-1C, the laser vehicle headlight system 100 for detecting anincident laser light 110 and outputting a headlight 120 includes aheadlight body 200, an optical unit 300 and a light leakage detectingunit 400.

The headlight body 200 is mounted on a vehicle and has a rectangularplate-like shape. The optical unit 300 is disposed on the headlight body200 and receives the incident laser light 110. The optical unit 300includes a fluorescent member 310 and a headlight reflecting surface320. The fluorescent member 310 is disposed on an initial light path ofthe incident laser light 110. When the laser vehicle headlight system100 is in the normal state, the fluorescent member 310 is illuminated bythe incident laser light 110 to induce a stable light 112 travelingalong a stable light path. On the contrary, when the laser vehicleheadlight system 100 is in the abnormal state, a light induced from thefluorescent member 310 has the issue of the space color shift, whichrefers to a “yellow halo” resulting from a blue shift in the middle andyellow shift in periphery. The space color shift may render adverseeffect to the human body in the case of extremely high color temperatureat certain angles. The light having the space color shift is defined asa light source of a light leakage detection. The fluorescent member 310is illuminated by the incident laser light 110 to induce the stablelight 112 and an offset detecting light 114. The stable light 112travels along a stable light path, and the offset detecting light 114travels along an offset detecting light path. The offset detecting light114 is the light source of the light leakage detection. The stable lightpath is different from the offset detecting light path. In addition, theincident laser light 110 is a blue laser beam, and the blue laser beamhas a wavelength which is greater than or equal to 400 nm and less thanor equal to 500 nm. The fluorescent member 310 is a yellow fluorescentmember. When the yellow fluorescent member (i.e. the fluorescent member310) is illuminated by the blue laser beam (i.e. the incident laserlight 110), the yellow fluorescent member generates a white light, i.e.the stable light 112. The light source of the light leakage detection(i.e. the offset detecting light 114) has the phenomenon of yellow haloproduced by the yellow fluorescent member. Moreover, the headlightreflecting surface 320 is disposed at the stable light path of thestable light 112. The headlight reflecting surface 320 receives thestable light 112, and the stable light 112 is then reflected by theheadlight reflecting surface 320 to generate the headlight 120 which isa white light.

The light leakage detecting unit 400 is disposed on the headlight body200. The light leakage detecting unit 400 includes a first ellipticalreflecting surface 410 and a light detector 420. The first ellipticalreflecting surface 410 has a first elliptical reflecting focal point F1and is corresponding to the fluorescent member 310. The first ellipticalreflecting surface 410 is adjacent to the fluorescent member 310. Thereis a first distance D1 between the first elliptical reflecting surface410 and the initial light path of the incident laser light 110. Thefirst distance D1 can be adjusted according to the change of therelative position between the fluorescent member 310 and the firstelliptical reflecting surface 410. Furthermore, the light detector 420is disposed at the first elliptical reflecting focal point F1 of thefirst elliptical reflecting surface 410. The light detector 420 isindirectly connected to the headlight body 200 via a supporting member422. In other words, two ends of the supporting member 422 are connectedto the light detector 420 and the headlight body 200, respectively. Thelight detector 420 is a blue light detector for receiving a specificreflected light from the first elliptical reflecting surface 410. Thefirst elliptical reflecting surface 410 has a first aspect ratio. Inaddition, the light leakage detecting unit 400 is located on the offsetdetecting light path of the offset detecting light 114. The firstelliptical reflecting surface 410 receives the offset detecting light114, and the offset detecting light 114 is then reflected by the firstelliptical reflecting surface 410 to generate a leakage light 116. Theleakage light 116 travels along a leakage light path to illuminate thelight detector 420. The leakage light 116 is the specific reflectedlight reflected from the first elliptical reflecting surface 410. Inother words, the light detector 420 is located on the leakage light pathof the leakage light 116. The light detector 420 is disposed at thefirst elliptical reflecting focal point F1 of the first ellipticalreflecting surface 410. The light detector 420 receives the leakagelight 116 and outputs a light leakage signal to a display device or awarning device (not shown) for alerting the driver that the laservehicle headlight system 100 has been in the abnormal state. Therefore,the laser vehicle headlight system 100 of the of the present disclosurecan use a specific elliptical reflecting surface to collect the leakagelight 116 which is induced from the fluorescent member 310 and receivedby the light detector 420, thereby instantly supervising abnormalconditions according to the light detector 420. It not only cansupervise abnormal conditions, but also increase the safety andreliability of the laser vehicle headlight system 100. Furthermore, thelaser vehicle headlight system 100 has a simple structure and isrelatively suitable for use in high energy requirements. The firstelliptical reflecting surface 410 combined with the headlight reflectingsurface 320 is utilized to detect the light having yellow shift inperiphery, thereby preventing influence of brightness of the originalheadlight 120.

FIG. 2A is a schematic view showing a laser vehicle headlight system 100a according to another embodiment of the present disclosure; FIG. 2B isa schematic view showing a normal state of the laser vehicle headlightsystem 100 a of FIG. 2A; and FIG. 2C is a schematic view showing anabnormal state of the laser vehicle headlight system 100 a of FIG. 2A.In FIGS. 2A-2C, the laser vehicle headlight system 100 a for detectingan incident laser light 110 and outputting a headlight 120 includes aheadlight body 200, an optical unit 300 and a light leakage detectingunit 400 a.

In FIGS. 2A-2C, the details of the headlight body 200 and the opticalunit 300 are the same as the headlight body 200 and the optical unit 300of FIGS. 1A-1C, respectively. In FIGS. 2A-2C, the laser vehicleheadlight system 100 a further includes the light leakage detecting unit400 a. The light leakage detecting unit 400 a includes a light detector420 and a second elliptical reflecting surface 430. The secondelliptical reflecting surface 430 is disposed on the headlight body 200and has a second elliptical reflecting focal point F2. One end of thesecond elliptical reflecting surface 430 is connected to the headlightbody 200. The second elliptical reflecting surface 430 is adjacent tothe fluorescent member 310 and is corresponding to the fluorescentmember 310. There is a second distance D2 between the second ellipticalreflecting surface 430 and the initial light path of the incident laserlight 110. The second distance D2 may be adjusted according to thechange of the relative position between the fluorescent member 310 andthe second elliptical reflecting surface 430. The second ellipticalreflecting surface 430 has a second aspect ratio. In addition, the lightdetector 420 is connected to the other end of the second ellipticalreflecting surface 430. The light detector 420 is disposed at the secondelliptical reflecting focal point F2. The light detector 420 is a bluelight detector for receiving a specific reflected light (i.e. theleakage light 116) from the second elliptical reflecting surface 430.Accordingly, the laser vehicle headlight system 100 a of the of thepresent disclosure can employ a specific elliptical reflecting surfaceto collect the leakage light 116 which is induced from the fluorescentmember 310 and received by the light detector 420 so as to instantlysupervise abnormal conditions according to the light detector 420. Thelaser vehicle headlight system 100 a not only can detect abnormalconditions in real time, but also increase the safety and reliability.Moreover, the second elliptical reflecting surface 430 combined with theheadlight reflecting surface 320 is used to detect the light havingyellow shift in periphery so as to prevent influence of brightness ofthe original headlight 120.

FIG. 3A is a schematic view showing a laser vehicle headlight system 100b according to further another embodiment of the present disclosure;FIG. 3B is a schematic view showing a normal state of the laser vehicleheadlight system 100 b of FIG. 3A; and FIG. 3C is a schematic viewshowing an abnormal state of the laser vehicle headlight system 100 b ofFIG. 3A. In FIGS. 3A-3C, the laser vehicle headlight system 100 b fordetecting an incident laser light 110 and outputting a headlight 120includes a headlight body 200, an optical unit 300 and a light leakagedetecting unit 400 b.

In FIGS. 3A-3C, the details of the headlight body 200 and the opticalunit 300 are the same as the headlight body 200 and the optical unit 300of FIGS. 1A-1C, respectively. In FIGS. 3A-3C, the laser vehicleheadlight system 100 b further includes the light leakage detecting unit400 b. The light leakage detecting unit 400 b includes a firstelliptical reflecting surface 410, a light detector 420 and a secondelliptical reflecting surface 430. The first elliptical reflectingsurface 410 has a first elliptical reflecting focal point F1 and iscorresponding to the fluorescent member 310. The first ellipticalreflecting surface 410 is adjacent to the fluorescent member 310. Thereis a first distance D1 between the first elliptical reflecting surface410 and the initial light path of the incident laser light 110.Furthermore, the second elliptical reflecting surface 430 has a secondelliptical reflecting focal point F2. One end of the second ellipticalreflecting surface 430 is connected to the headlight body 200. Thesecond elliptical reflecting surface 430 is adjacent to the fluorescentmember 310 and is corresponding to the fluorescent member 310. There isa second distance D2 between the second elliptical reflecting surface430 and the initial light path of the incident laser light 110. Inaddition, the first elliptical reflecting surface 410 and the secondelliptical reflecting surface 430 are corresponding to each other andboth surround the fluorescent member 310. The first ellipticalreflecting surface 410 and the second elliptical reflecting surface 430are separated from each other and are both disposed on the headlightbody 200. In detail, the first elliptical reflecting surface 410surrounds the fluorescent member 310 with a first angle that ranges fromgreater than 180 degrees to less than 360 degrees. The second ellipticalreflecting surface 430 surrounds the fluorescent member 310 with asecond angle that ranges from greater than 0 degrees to less than 90degrees. The first distance D1 is greater than the second distance D2.The second elliptical reflecting focal point F2 and the first ellipticalreflecting focal point F1 overlap each other and are both located at aposition of the light detector 420. Moreover, the light detector 420 isconnected to the other end of the second elliptical reflecting surface430. The second elliptical reflecting surface 430 is connected betweenthe light detector 420 and the headlight body 200. The light detector420 is a blue light detector for receiving plural specific reflectedlights (i.e. the leakage lights 116) from the second ellipticalreflecting surface 430 and the first elliptical reflecting surface 410.When the laser vehicle headlight system 100 b is in the abnormal state,the light detector 420 combined with a ring structure of pluralelliptical reflecting surfaces may collect the leakage lights 116reflected by multiple elliptical reflecting surfaces to increase thesafety and reliability of the laser vehicle headlight system 100 b. Inaddition, the first elliptical reflecting surface 410 and the secondelliptical reflecting surface 430 combined with the headlight reflectingsurface 320 are employed to completely collect the leakage lights 116according to one common focal point of multiple elliptical reflectingsurfaces, thereby preventing influence of brightness of the originalheadlight 120. A coverage area of the first elliptical reflectingsurface 410 is greater than a first lower limit value. A coverage areaof the second elliptical reflecting surface 430 is greater than a secondlower limit value. The first lower limit value is greater than thesecond lower limit value so as to make sure that all leakage lights aredisposed at the common focal point of multiple elliptical reflectingsurfaces. In other words, the partial overlapping ring structure ofmultiple elliptical reflecting surfaces can avoid a portion of theleakage lights passing through a gap between the first ellipticalreflecting surface 410 and the second elliptical reflecting surface 430or a boundary of one of the elliptical reflecting surfaces. If a portionof the leakage lights cannot be collected by the elliptical reflectingsurfaces, it must cause loss of light energy, thus affecting the safetyand reliability of the laser vehicle headlight system 100 b. Therefore,the special structure of the present disclosure can overcome the aboveproblems and detect the leakage lights without waste of light energy.

In FIG. 3A, the first elliptical reflecting surface 410 and the secondelliptical reflecting surface 430 are separated from each other andcorresponding to each other. In another embodiment (not shown), thefirst elliptical reflecting surface 410 is integrally connected to thesecond elliptical reflecting surface 430 to form a complete ring. Thereflecting surface with the complete ring is connected to the headlightbody 200 and fully surrounds the fluorescent member 310 for conductingthe light leakage detection.

FIG. 4 is a flow chart showing a detecting method 500 of the laservehicle headlight system 100 of FIG. 1 according to one embodiment ofthe present disclosure. The detecting method 500 of the laser vehicleheadlight system 100 provides a light inducing step S2 and a leakagelight collecting step S4. The light inducing step S2 is for transmittingthe incident laser light 110 to the fluorescent member 310 so as toinduce the stable light 112 from the fluorescent member 310. The leakagelight collecting step S4 is for checking whether or not an offsetdetecting light 114 is induced by the fluorescent member 310 accordingto the light detector 420. When the fluorescent member 310 only inducesthe stable light 112 without the offset detecting light 114, the laservehicle headlight system 100 is in the normal state, and the lightdetector 420 does not receive any leakage light. On the contrary, whenthe fluorescent member induces the stable light 112 and the offsetdetecting light 114, the laser vehicle headlight system 100 is in theabnormal state. The first elliptical reflecting surface 410 receives theoffset detecting light 114, and the offset detecting light 114 is thenreflected by the first elliptical reflecting surface 410 to generate aleakage light 116. The light detector 420 receives the leakage light 116and outputs a light leakage signal. For the same reason, the detectingmethod 500 can also be applied to the embodiments of the laser vehicleheadlight system 100 a, 100 b in FIGS. 2A-2C and 3A-3C. In FIGS. 2A-2C,the detecting method 500 of the laser vehicle headlight system 100 aprovides the leakage light collecting step S4 for collecting the offsetdetecting light 114 by the second elliptical reflecting surface 430 soas to generate a leakage light 116. The light detector 420 is disposedat the second elliptical reflecting focal point F2 of the secondelliptical reflecting surface 430. In FIGS. 3A-3C, the detecting method500 of the laser vehicle headlight system 100 b provides the leakagelight collecting step S4 for simultaneously collecting the offsetdetecting lights 114 by the first elliptical reflecting surface 410 andthe second elliptical reflecting surface 430. Then, the offset detectinglights 114 are reflected by the first elliptical reflecting surface 410and the second elliptical reflecting surface 430 to generate pluralleakage lights 116. The light detector 420 receives the leakage lights116. The second elliptical reflecting focal point F2 and the firstelliptical reflecting focal point F1 overlap each other and are bothlocated at a position of the light detector 420. Hence, the detectingmethod 500 of the laser vehicle headlight system 100, 100 a, 100 b ofthe present disclosure can use multiple elliptical reflecting surfaceswith one common focal point to completely collect the leakage lights 116which are induced from the fluorescent member 310 and received by thelight detector 420, so that the detecting method 500 can not onlysupervise abnormal conditions, but also increase the safety andreliability of the laser vehicle headlight system 100, 100 a, 100 b.

According to the aforementioned embodiments, the advantages of thepresent disclosure are described as follows.

1. The laser vehicle headlight system and detecting method thereof ofthe present disclosure can use multiple elliptical reflecting surfaceswith one common focal point to completely collect the leakage lightswhich are induced from the fluorescent member and received by the lightdetector so as to supervise abnormal conditions and increase the safetyand reliability of the system.

2. The laser vehicle headlight system and detecting method thereof ofthe present disclosure can collect all leakage lights at the commonfocal point of multiple elliptical reflecting surfaces, thus detectingthe leakage lights without waste of light energy of the headlight andpreventing influence of brightness of the headlight.

3. The laser vehicle headlight system and detecting method thereof ofthe present disclosure can utilize multiple elliptical reflectingsurfaces combined with the headlight reflecting surface to detect thelight having yellow shift in periphery, thereby preventing influence ofbrightness of the original headlight.

Although the present disclosure has been described in considerabledetail with reference to certain embodiments thereof, other embodimentsare possible. Therefore, the spirit and scope of the appended claimsshould not be limited to the description of the embodiments containedherein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the disclosure.In view of the foregoing, it is intended that the present disclosurecover modifications and variations of this disclosure provided they fallwithin the scope of the following claims.

What is claimed is:
 1. A laser vehicle headlight system for detecting anincident laser light and outputting a headlight, the laser vehicleheadlight system comprising: a headlight body; an optical unit disposedon the headlight body and receiving the incident laser light, and theoptical unit comprising: a fluorescent member disposed on an initiallight path of the incident laser light and illuminated by the incidentlaser light to induce a stable light traveling along a stable lightpath; and a light leakage detecting unit disposed on the headlight body,and the light leakage detecting unit comprising: a first ellipticalreflecting surface having a first elliptical reflecting focal point andadjacent to the fluorescent member, wherein there is a first distancebetween the first elliptical reflecting surface and the initial lightpath of the incident laser light; and a light detector disposed at thefirst elliptical reflecting focal point of the first ellipticalreflecting surface.
 2. The laser vehicle headlight system of claim 1,wherein the incident laser light is a blue laser beam, the fluorescentmember is a yellow fluorescent member, the light detector is a bluelight detector, and the blue laser beam has a wavelength which isgreater than or equal to 400 nm and less than or equal to 500 nm.
 3. Thelaser vehicle headlight system of claim 1, wherein the optical unitfurther comprising: a headlight reflecting surface disposed at thestable light path, wherein the headlight reflecting surface receives thestable light, the stable light is then reflected by the headlightreflecting surface to generate the headlight which is a white light. 4.The laser vehicle headlight system of claim 1, wherein the light leakagedetecting unit further comprising: a second elliptical reflectingsurface disposed on the headlight body and having a second ellipticalreflecting focal point, wherein the second elliptical reflecting surfaceis connected between the light detector and the headlight body, thesecond elliptical reflecting focal point and the first ellipticalreflecting focal point overlap each other and are located at a positionof the light detector.
 5. The laser vehicle headlight system of claim 4,wherein the first elliptical reflecting surface and the secondelliptical reflecting surface are separated from each other andcorresponding to each other.
 6. The laser vehicle headlight system ofclaim 4, wherein the first elliptical reflecting surface surrounds thefluorescent member with a first angle that ranges from greater than 180degrees to less than 360 degrees, the second elliptical reflectingsurface surrounds the fluorescent member with a second angle that rangesfrom greater than 0 degrees to less than 90 degrees, there is a seconddistance between the second elliptical reflecting surface and theinitial light path of the incident laser light, and the first distanceis greater than the second distance.
 7. A detecting method of the laservehicle headlight system of claim 1, comprising: providing a lightinducing step, wherein the light inducing step is for transmitting theincident laser light to the fluorescent member so as to induce thestable light from the fluorescent member; and providing a leakage lightcollecting step, wherein the leakage light collecting step is forchecking whether or not an offset detecting light is induced by thefluorescent member according to the light detector, when the fluorescentmember induces the offset detecting light, the first ellipticalreflecting surface receives the offset detecting light, the offsetdetecting light is then reflected by the first elliptical reflectingsurface to generate a leakage light, and the light detector receives theleakage light and outputs a light leakage signal.
 8. The detectingmethod of the laser vehicle headlight system of claim 7, wherein, thelight leakage detecting unit further comprises a second ellipticalreflecting surface, the second elliptical reflecting surface is disposedon the headlight body and has a second elliptical reflecting focalpoint; and in the leakage light collecting step, the first ellipticalreflecting surface and the second elliptical reflecting surfacesimultaneously receives the offset detecting light, the offset detectinglight is then reflected by the first elliptical reflecting surface andthe second elliptical reflecting surface to generate a leakage light,and the second elliptical reflecting focal point and the firstelliptical reflecting focal point overlap each other and are located ata position of the light detector.
 9. The detecting method of the laservehicle headlight system of claim 8, wherein the first ellipticalreflecting surface and the second elliptical reflecting surface areseparated from each other and corresponding to each other.
 10. Thedetecting method of the laser vehicle headlight system of claim 8,wherein the first elliptical reflecting surface surrounds thefluorescent member with a first angle that ranges from greater than 180degrees to less than 360 degrees, the second elliptical reflectingsurface surrounds the fluorescent member with a second angle that rangesfrom greater than 0 degrees to less than 90 degrees, there is a seconddistance between the second elliptical reflecting surface and theinitial light path of the incident laser light, and the first distanceis greater than the second distance.
 11. The detecting method of thelaser vehicle headlight system of claim 7, wherein the incident laserlight is a blue laser beam, the fluorescent member is a yellowfluorescent member, the light detector is a blue light detector, and theblue laser beam has a wavelength which is greater than or equal to 400nm and less than or equal to 500 nm.
 12. The detecting method of thelaser vehicle headlight system of claim 7, wherein the optical unitfurther comprising: a headlight reflecting surface disposed at thestable light path, wherein the headlight reflecting surface receives thestable light, the stable light is then reflected by the headlightreflecting surface to generate the headlight which is a white light. 13.A laser vehicle headlight system for detecting an incident laser lightand outputting a headlight, the laser vehicle headlight systemcomprising: a headlight body; an optical unit disposed on the headlightbody and receiving the incident laser light, and the optical unitcomprising: a fluorescent member disposed on an initial light path ofthe incident laser light and illuminated by the incident laser light toinduce a stable light and an offset detecting light, wherein the stablelight travels along a stable light path, and the offset detecting lighttravels along an offset detecting light path; and a headlight reflectingsurface disposed at the stable light path, wherein the headlightreflecting surface receives the stable light, and the stable light isthen reflected by the headlight reflecting surface to generate theheadlight; and a light leakage detecting unit disposed on the headlightbody and comprising: a first elliptical reflecting surface having afirst elliptical reflecting focal point and located on the offsetdetecting light path, wherein the first elliptical reflecting surface isadjacent to the fluorescent member, the first elliptical reflectingsurface receives the offset detecting light, and the offset detectinglight is then reflected by the first elliptical reflecting surface togenerate a leakage light, and the leakage light travels along a leakagelight path; and a light detector disposed at the first ellipticalreflecting focal point of the first elliptical reflecting surface andlocated on the leakage light path, wherein the light detector receivesthe leakage light and outputs a light leakage signal.
 14. The laservehicle headlight system of claim 13, wherein the light leakagedetecting unit further comprising: a second elliptical reflectingsurface disposed on the headlight body and having a second ellipticalreflecting focal point, wherein the second elliptical reflecting surfaceis connected between the light detector and the headlight body, thesecond elliptical reflecting focal point and the first ellipticalreflecting focal point overlap each other and are located at a positionof the light detector.
 15. The laser vehicle headlight system of claim14, wherein the first elliptical reflecting surface and the secondelliptical reflecting surface are separated from each other andcorresponding to each other.
 16. The laser vehicle headlight system ofclaim 14, wherein the first elliptical reflecting surface surrounds thefluorescent member with a first angle that ranges from greater than 180degrees to less than 360 degrees, the second elliptical reflectingsurface surrounds the fluorescent member with a second angle that rangesfrom greater than 0 degrees to less than 90 degrees, there is a firstdistance between the first elliptical reflecting surface and the initiallight path of the incident laser light, there is a second distancebetween the second elliptical reflecting surface and the initial lightpath of the incident laser light, and the first distance is greater thanthe second distance.
 17. The laser vehicle headlight system of claim 13,wherein the incident laser light is a blue laser beam, the fluorescentmember is a yellow fluorescent member, the light detector is a bluelight detector, and the blue laser beam has a wavelength which isgreater than or equal to 400 nm and less than or equal to 500 nm.